• Head (ft.) = (psi x 2.31) / sp. gr. = (in. Hg.) / (sp. gr. x .88)

• PS1 = (head (ft.) x sp.gr) / 2.31 = (.49 x in. x Hg.)

• Velocity (ft./sec.) = (0.4085 x gpm) / [i.d. (in.) of pipe] ^ 2

• BHP (Centrifugal) = (GMP x head (ft.) x sp. gr.) / (3960 x pump eff)

• BHP Positive Displacement = (GMP X PSI) / (1715 x pump eff.)